Question

fill in the blank question
a collection of one or more columnar or cuboidal epithelial cells that are specialized to produce and secrete substances into ducts or body fluids is called a(n) blank.
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Explanation:

Epithelial cells specialized in secretion form glands. Glands can secrete substances into ducts (exocrine glands) or directly into body fluids (endocrine glands).

Answer:

gland